diff --git a/drivers/char/mwave/Makefile b/drivers/char/mwave/Makefile
index 26b4fce..efa6a82 100644
--- a/drivers/char/mwave/Makefile
+++ b/drivers/char/mwave/Makefile
@@ -9,7 +9,7 @@
 mwave-y := mwavedd.o smapi.o tp3780i.o 3780i.o
 
 # To have the mwave driver disable other uarts if necessary
-# EXTRA_CFLAGS += -DMWAVE_FUTZ_WITH_OTHER_DEVICES
+# ccflags-y := -DMWAVE_FUTZ_WITH_OTHER_DEVICES
 
 # To compile in lots (~20 KiB) of run-time enablable printk()s for debugging:
-ccflags-y := -DMW_TRACE
+ccflags-y += -DMW_TRACE
diff --git a/drivers/char/mwave/README b/drivers/char/mwave/README
index 480251f..c2a58f4 100644
--- a/drivers/char/mwave/README
+++ b/drivers/char/mwave/README
@@ -11,7 +11,7 @@
 	0x0008 tp3780i tracing
 
         Tracing only occurs if the driver has been compiled with the
-        MW_TRACE macro #defined  (i.e. let EXTRA_CFLAGS += -DMW_TRACE
+        MW_TRACE macro #defined  (i.e. let ccflags-y := -DMW_TRACE
         in the Makefile).
 
   mwave_3780i_irq=5/7/10/11/15